P. destructor. It is also important to space plants out when planting them and ensure that the soil has adequate drainage to avoid overwatering. Throughout the growing season and after harvest, removing plant debris can be helpful in preventing the spread of P. destructor. Cultivators may also avoid entering the field when it is wet, as well as avoid injuring the plants as they are growing to prevent P. destructor or other pathogens from invading host plants.Biological Control: An additional control mechanism includes selective breeding for plants that are resistant to the pathogen. Qualities of resistant plants include small cells with thick cell walls, flat leaves with pronounced layers, and high cuticular wax content. Cultural control is another method for controlling the spread of P. destructor. This may include avoiding sprinkler irrigation, using bulbs and seeds that are disease free, aligning rows with normal wind patterns, and planting Allium species during times when P. destructor'' is least likely to infect plants. Further reading References Peronosporales Species described in 1849 Water mould plant pathogens and diseases Vegetable diseases